Reynolds criterion

Reynolds criterion

[′ren·əlz ‚krī‚tir·ē·ən]
(fluid mechanics)
The principle that the type of fluid motion, that is, laminar flow or turbulent flow, in geometrically similar flow systems depends only on the Reynolds number; for example, in a pipe, laminar flow exists at Reynolds numbers less than 2000, turbulent flow at numbers above about 3000.
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0] is Reynolds criterion for cooling medium; [alpha] is value of heat exchange coefficient which is average for the exposed surface W/[m.
Reynolds criterion characterizes speed of medium's movement in relation to solid body:
On one hand, water must flow with Re criterion as large as possible, so that the absorption of heat from the interior face of the tube should require small temperature drops and on the other hand, Reynolds criterion must be as small as possible so that the difference of pressure linked to water recirculation should be techno-economical acceptable.